The enemy - the ball. If your children grews up using sporting equipment
regularly, this distracts from them becoming a geek.

Python is slow. Events are 10ms apart.

Pixl perfect intersection is slow.

88x8 array of masks instead of pixel perfect.

Too much abstraction.

I optimized the two year old out of the presentation. The two year old is not a
real two year old.

Build robustly. Need hours of time, due to small attention span of kids.

Make it reliable. If it doesn’t work all the time, the evil ball will win.

Trivial. Kids only have short attention span. Make it simple.

Wiiremote, could attach to child. Tell if child is sitting up or not or lying
down. Difference between what I did and strapping child full of electronics. At
least I hope the child walfare agencies will see it that way.